vascular sac的意思|示意

The hematopoietic and vascular systems of the mouse arise from extraembryonic mesoderm that migrate through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.

小鼠的造血和血管系统起源于胚外中胚层。胚胎期6.5-7天时在卵黄囊形成特征性的血岛结构发生向造血和内皮细胞的分化。

Methods:(1)excision of aneurysmal sac and microsuturing for vascular reconstruction;

方法：（1）切除动脉瘤壁，重建载瘤动脉。